ENH: added new logos
MAINT: updated credit for logo
MAINT: fixed typo
ENH: Speed up travis build

The previous configuration file would run the test suite twice, and
would always submit a coveralls report (even if the tests failed).
BUG: Remove coverage from pip install

No longer needed.
Merge pull request #546 from ElDeveloper/fasTravis

ENH: Speed up travis build
MAINT: removing initial logo idea
MAINT: removing in favor of logos in individual files
MAINT: added new logo files
Merge pull request #545 from gregcaporaso/add-logos

ENH: added new logos